ToolWindow not displaying content correctly w/ multimonitor

Hello,

I'm on my second day of trialing the docking controls and while it was extremely easy to get going at first with my layout, I've now hit what looks like a bug but I'm not sure.

I have a three-monitor setup (main center, left of main + right of main) and the ToolWindows display correctly when shown within the main center monitor. As soon as the ToolWindow is dragged out to either left or right monitors, it does not display correctly when it refreshes after the drop.

The objects inside the ToolWindow are styled with DataTemplates on datatypes:

<DataTemplate DataType="{x:Type data:MyViewModel}" >
Draw border etc...
</DataTemplate>

When I move the ToolWindows to left or right monitors, my styled borders disappear and all I see are the class names instead:

MyNamespace.ViewModels.MyViewModel

If I move them back to the central monitor, it seems to refresh OK and my borders come back.

Is this a bug or are multi-monitor setups not supported?

Thanks.